Coccidotrophus trinidadensis Halstead, 2020

Halstead, David G. H., 2020, New and little known Coleoptera (Silvanidae: Silvaninae) from Central and South America, Insecta Mundi 2020 (842), pp. 1-37 : 25

Coccidotrophus trinidadensis Halstead , new species

( Fig. 85–90 )

Discussion. The only specimen of this new species known to the author was sent by Dr. M. C. Thomas. Although at present there is no information on habitat, its elongate form etc. is closely similar to that of other Coccidotrophus species suggesting that it may utilize similar habitats.

Diagnosis. Coccidotrophus trinidadensis is most similar to C. platyops but the eye size and the head shape, the deep very conspicuous and convergent antennal grooves beneath it and the form of the male genitalia of C. trinidadensis readily distinguish it from C. platyops .

Description. The following description is based on a single male specimen. Length 4.37 mm, total length to maximum elytral breadth ratio, 10:6; general appearance sub-cylindrical, very elongate, shining, glabrous and castaneous

Head. Slightly broader than long, ratio of about 12:10, large part of head flat; neck with large, shallow, circular punctures; sides with lateral carina from above eyes to front, latter not emarginate, without obvious depression above antennal insertions; moderately densely punctate with pairs of punctures that are rounder than those on pronotum; eyes appearing small in dorsal view (difficult to see unless head slightly tilted), in ventral view very large with bordering deep and convergent antennal grooves (similar to those in Eunausibius spp. , see Fig. 101 ); temples angled to base of head; antennae with club antennomeres 9 and 10 broader and much larger than rest, antennomere 1 hidden by side of head.

Pronotum. Long, nearly 2× as long as broad, length to breadth ratio, 19:10, greatest breath towards base, sides slightly sinuate to middle; anterior angles only slightly developed, breadth across these angles similar to that across temples of head; posterior angles obtuse; disc with pairs of punctures ( Fig. 85 ), medially on front half some pairs separate, but towards sides of disc and from anterior to posterior margin of pronotal declivities the pairs tend to join up forming irregular and sometimes curved lines.

Prosternum, metasternum and abdominal ventrites 1 and 2. Sides of prosternum shallowly depressed forming longitudinal medial ridge on apical half; sides of metasternum and abdominal ventrites 1 and 2 also depressed (for ventrites see Fig. 86 ). Depressions apparently for accommodating folded legs.

Abdomen. First abdominal ventrite with femoral lines extending to caudal fifth ( Fig. 86 ).

Legs. Tibiae have a small apical spine, protibiae ( Fig. 85 ) are particularly wide apically; metafemora have a deep groove on basal half of underside, folded metatibiae are received by this groove, proximal side of groove is weakly carinate, possibly a secondary sexual character.

Elytra. Virtually parallel sided and sub-cylindrical, length to breadth ratio, 10:36; nine rows of punctures forming striae, only seven visible in dorsal view ( Fig. 85 ).

Male genitalia. ( Fig. 87–90 ) Parameres elongate, about 5× as long as broad, outer margin straight, inner narrowing to apex from about basal half, apical third with a few very small setae, each outer margin with about 14 setae of moderate length becoming longer at apex, with a few short ones on remaining margin; median lobe large, slightly rounded apically, with a few marginal apical setae on each side; area towards ostium with about 25–27 rods on each side; internal sac with an indication of a poorly developed armature; sternite 8 on each side with 6 or 7 long setae and 5 short ones ( Fig. 90 ).

Material examined. Holotype male “ TRINIDAD: Talparo July 6–22-1988 Coll, H. L. Dozier. ” ( FSCA).

Figures

Figures 85–90. Coccidotrophus trinidadensis new species, male holotype. 85) Habitus, inset illustrations of a few paired head punctures, also antennomeres 1–2; other puncture illustrations given as examples of pronotal paired punctures and elytral strial punctures. 86) First and second abdominal ventrites. 87–90) Genitalia and associated sclerites. 87) Genitalia, without most of internal sac. 88) Paramere enlarged. 89) Internal sac. 90) Sternites 8–9. Scale lines for Figures 85–86 = 2.0 mm, for Figures 87, 89–90 = 0.2 mm.

Figures 98–102. Eunausibius jatahyensis, new species, types. Dots on pronotal disc show position of narrow, medial impunctate region. 98) Habitus, holotype male (Jatahy). 99) Habitus, paratype female (Jatahy). 100) Head, paratype female with smaller eyes dorsal view (Minas Gerais). 101) Head of holotype, ventral view to show eyes plus deep antennal grooves. 102) Elytron, small part enlarged (margin of suture on left) to show strial punctures, also very short, fine setae. Scale lines = 2.0 mm.